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AOC 65 Soil Vapor Extraction System - Operation and Maintenance Plan
Section 1 - Introduction and Summary of Remedial Design
This Operations and Maintenance (O&M) Plan was created as a guide for operating, monitoring and maintaining soil vapor extraction (SVE) equipment and vapor well plumbing installed at Camp Stanley Storage Activity (CSSA) in Boerne, Texas. Two SVE systems were installed to address Area of Concern (AOC)-65, to remediate soil, fractured rock and groundwater contamination underneath and around Building 90.SVE is the forced evacuation of soil gas from the subsurface using vacuum equipment. Vacuum blowers connected to vapor extraction wells (VEW) with pipe are typically used to evacuate volatile organic compounds (VOC), water vapor, and any air from the subsurface. Contaminated soil gas as well as VOC dissolved in groundwater can be removed using SVE, thereby either remediating contamination or reducing its continued migration.
In 2002, Parsons Infrastructure and Technology Inc. (Parsons) installed seven VEWs on the west side of Building 90 and 12 VEWs beneath Building 90 along with the associated piping and equipment comprising the SVE systems. Two regenerative vacuum blowers were installed and piped to a vessel of granular activated carbon (GAC), designed to remove all VOC emissions prior to discharge to the atmosphere.
The objective of operating these systems is to enable removal of VOC vapor to promote remediation and reduce migration of contaminants in the groundwater. The objective of continued monitoring activities is to gather additional data to allow an evaluation and optimization of the systems’ performance.
Although SVE systems are relatively simple, routine monitoring and maintenance of the SVE system is required to keep it operating at its optimum condition. If significant problems are encountered with the operation of the system, the CSSA Environmental Officer, Mr. Brian Murphy at (210) 698-5208 should be notified so repairs can be initiated and coordinated. Alternatively, contact the Parsons Project Manager, Mr. Brian Vanderglas at (512) 719-6000, or the Parsons Onsite Manager, Mr. Kyle Caskey at (210) 336-1164.
A layout drawing and a schematic of the SVE systems are provided in Sections 2 and 3 of this document. In addition, a chronology of activities and investigations performed at AOC-65 is provided in the report Area of Concern 65 Interim Removal Action, Parsons Infrastructure and Technology Group, Austin, Texas, August, 2003 (Parsons 2003a) and the Draft Interim Treatability Study Report, Parsons Infrastructure and Technology Group, Austin, Texas, 2003 (Parsons 2003b). These documents can both be found in the CSSA Environmental Encyclopedia (AOC 65 Links).